ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
COMPLETELY SELF-CONTAINED
 Structural Vacuum Infused Fiberglass
 Back Yard or Under Slab
 Self-Contained-Fully Assembled
 Chemical Toilet
 12 v. Battery Bank
 12 v. Air Supply System
 12 v. Lighting
PROTECTION FROM
 F 5 Tornadoes
 CAT 5 Hurricanes
 Forest Fires
 8.5 R Earthquakes
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
Structural Fiberglass Shelter:
 Not Hydroscopic - doesn't absorb water
 Non Corrosive - doesn't rust, leach, corrode, or degrade-Lifetime Warranty
 Watertight - can be installed below water table
 Gravity Flange for installation below high water tables reaching the ground surface
 Gas tight - doesn't collect radon gas, methane, and soil odors
 Non Conductive - safe from downed power lines and static discharge
 Bug tight - no bugs when vents and hatch are closed; screened intake and exhaust when open
 Manufactured - not built on site; permit not required, can be moved
 Strong – elliptical dome ceiling (pressure vessel) will not implode, unprecedented strength
 Smooth white interior surface - easy to clean sanitary and reflects light
THE ND6 Twister Resister
The ND6 (Natural Disaster
for 6 to 10 shelterists)
Twister Resister shelter is a
totally self-contained 5 psi
vertical dome underground
storm shelter specifically
designed to protect 6-10
people at ground zero of F5
tornados, CAT 5 hurricanes,
8.5 Richter earthquakes, and
ground fires with a 2 day life
support
system.
It
is
specifically
designed
to
operate at ground zero of an
F5 tornado. The ND6
includes
the
structural
fiberglass
structure,
chemical toilet, 12-volt air
blower, AGM battery, solar
panel/controller,
stainless
steel screen on inlet and
outlet manifolds, 12-volt
LED light, cast aluminum or spring loaded steel hatch, manual jack emergency escape, and gravity flange holddown for high water tables and the negative pressure of an F5 tornado.
USING THE SHELTER
The ND6 is large enough in volume at 392 ft3 with 52 ft2 floor space to use for pre-disaster use. It is equipped
with battery power, LED light, toilet, air blower, sitting area, and hazard alert radio, to allow shelterists to stay in
the shelter during a tornado watch or warning before the tornado reaches your home. Shelterists can still use the
shelter by the "OZ" theory where you wait until the last minute when the tornado is in your back yard and then
"run as fast as you can" to the shelter and hope you reach the shelter and don't get hurt getting to the shelter. The
briefcase size toilet sewage holding tank, is manually taken out of the shelter and dumped into the household
toilet and then reconnected to the toilet in the shelter.
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
DESIGN
The ND6 is a third generation Storm Shelter designed and developed by Walton W. McCarthy, M.E., author of
PRINCIPLES of PROTECTION, U.S. Handbook of NBC Weapon Fundamentals and Shelter Engineering
Standards, Sixth Edition 2012 which is the United State’s bible on shelter engineering. He is the principle
engineer of Radius Engineering
Inc., with over 36 years’
experience designing “hightech” underground shelters. The
book is known in the industry
as P.O.P. The ND6 was
designed using CAD (computer
aided drafting), CAE (computer
aided engineering), and FEAM
(3-dimensional finite element
analysis and modeling). The
tube dome shape of the ND6
allows it to be a true pressure
vessel for resistance to high
external pressure and full height
water tables. The ND6 shelter
system is based on 22 years
field
experience
with
McCarthy’s successful ES10
and larger sisters, P6 and P10,
and
CAT
25
fiberglass
underground shelters.
SHELTER CONSTRUCTION
The ND6 is made of structural vacuum infused structural fiberglass manufactured to underground storage tank
standards of Underwriters Laboratory, American Society of Testing and Materials, and shelter engineering
standards of PRINCIPLES of PROTECTION. Fiberglass was chosen as the optimum material because of its
extremely high resiliency and corrosion resistance plus its ability to be shaped into a compound curved structure.
The 5 psi (pounds per square inch) external pressure resistance, with no earth arching, is constant over the first
150 years and does not have to be de-rated each year like steel due to corrosion. Fiberglass also forms a complete
vapor barrier which provides a dry atmosphere when placed below ground, and it has proven to be sound in the
underground storage tank industries. In addition, one of the greatest characteristics of fiberglass is its ability to
“remain intact” if overstressed. The inside of the shelter is smooth, curved, and white to create maximum
brightness with minimal light. All of these facilities function without outside electricity through the use of a 12volt, deep-cycle AGM batteries. The inside surface is easily cleaned with common detergents and is easily
repaired.
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
SHELTER FACILITIES The ND6 contains 392 cubic feet with 6.5 to 8 ft. of headroom. This allows for almost
normal living and a spacious feeling. There is ample light for reading anywhere in the shelter supplied by an LED
light located near the shelter ceiling. Fresh air is brought into the shelter by a 12-volt 40 cfm air blower mounted
to a screened air inlet manifold and designed to operate 24 hours per day for approximately 2 days from one
battery. The blower supplies many times the breathing volume of air required by adults and produces a complete
air change inside the shelter every 10 minutes. This system has the advantage of maintaining constant shelter
temperature, constant shelter oxygen levels, constant shelter carbon dioxide levels, and constant shelter moisture
levels, plus it prevents overheating. Exhausting of hot, moist, spent air is facilitated through the screened air outlet
at the highest point in the shelter where it exits the shelter. This is the most efficient geometry for exhausting
spent air. One 100 AH AGM battery provides power for two days. An Absorbed Glass Mat (AGM) battery
recombines the hydrogen gas generated during charging into water which drains back into the battery so hydrogen
gas is not released into the
shelter. The normal loss of
battery
power
is
approximately 1.5% per
month when the battery
charger is not operating. A
photovoltaic panel (solar
panel) is supplied to
maintain the battery charge
level. An optional 6-amp
115 volt AC controlling
battery charger can be
mounted in the shelter to
maintain the battery charge
from outside AC power. A
thru-hull coupling in the
shelter entranceway is used
to connect an underground
cable from the shelter to
the nearest power supply.
An optional chemical toilet
will provide duration with
6 adults of approximately 5
days.
Shelter Hatch
The standard ND6 is supplied with a commercial aluminum hatch with a 24 in x 24 in clear opening. An optional
spring loaded steel hatch is available. Both hatches are recessed below ground level so the hatch is protected from
flying debris. Both hatches are opened and closed using a mechanical key on both sides of the hatch.
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
STEEL HATCH
ALUMINUM HATCH
HURRICANES
The ND6 is intended to be used by shelterists one day prior to the hurricane reaching your home and one
day after the hurricane reaches your home. With seating, bunks, battery power, light, toilet, and radio it will
provide a good survival standard of living. The hurricane scale is based on the Saffir-Simpson Hurricane
Scale or SSHS. The scale was developed in 1971 by civil engineer Herbert Saffir and meteorologist Bob
Simpson who was the director of the US National Hurricane Center. The SSHS scale was introduced to the
public in 1973. The Saffir-Simpson Hurricane Scale is a 1-5 rating based on the hurricane's intensity. The
scale is used estimate the potential property damage and flooding expected along the coast from a hurricane
landfall. Wind speed is the determining factor in the scale, as storm surge values are highly dependent on
the slope of the continental shelf and the shape of the coastline, in the landfall region.
Category 1 Hurricane
Winds 74-95 mph. Storm surge generally 4-5 ft above normal. No real damage to building
structures. Damage primarily to unanchored mobile homes, shrubbery, and trees. Some damage
to poorly constructed signs. Also, some coastal road flooding and minor pier damage.
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
Category 2 Hurricane
Winds 96-110 mph. Storm surge generally 6-8 feet above normal. Some roofing material, door,
and window damage of buildings. Considerable damage to shrubbery and trees with some trees
blown down. Considerable damage to mobile homes, poorly constructed signs, and piers. Coastal
and low-lying escape routes flood 2-4 hours before arrival of the hurricane center. Small craft in
unprotected anchorages break moorings.
Category 3 Hurricane
Winds 111-130 mph. Storm surge generally 9-12 ft above normal. Some structural damage to
small residences and utility buildings with a minor amount of curtain wall failures. Damage to
shrubbery and trees with foliage blown off trees and large trees blown down. Mobile homes and
poorly constructed signs are destroyed. Low-lying escape routes are cut off by rising water 3-5
hours before arrival of the center of the hurricane. Flooding near the coast destroys smaller
structures with larger structures damaged by battering from floating debris. Terrain continuously
lower than 5 ft above mean sea level may be flooded inland 8 miles (13 km) or more. Evacuation
of low-lying residences with several blocks of the shoreline may be required.
Category 4 Hurricane
Winds 131-155 mph. Storm surge generally 13-18 ft above normal. More extensive curtain wall
failures with some complete roof structure failures on small residences. Shrubs, trees, and all
signs are blown down. Complete destruction of mobile homes. Extensive damage to doors and
windows. Low-lying escape routes may be cut by rising water 3-5 hours before arrival of the
center of the hurricane. Major damage to lower floors of structures near the shore. Terrain lower
than 10 ft above sea level may be flooded requiring massive evacuation of residential areas as far
inland as 6 miles (10 km).
Category 5 Hurricane
Winds greater than 155 mph. Storm surge generally greater than 18 ft above normal. Complete
roof failure on many residences and industrial buildings. Some complete building failures with
small utility buildings blown over or away. All shrubs, trees, and signs blown down. Complete
destruction of mobile homes. Severe and extensive window and door damage. Low-lying escape
routes are cut by rising water 3-5 hours before arrival of the center of the hurricane. Major
damage to lower floors of all structures located less than 15 ft above sea level and within 500
yards of the shoreline. Massive evacuation of residential areas on low ground within 5-10 miles
(8-16 km) of the shoreline may be required.
TORNADOS
Tornado F-Scale
Windspeed (mph)
F0
40-72
F1
73-112
F2
113-157
F3
158-206
F4
207-260
F5
261-318
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
FIRES and SEALED SHELTER ATMOSPHERE
When ground fires are
present around the hatch,
the air blower should not be
12.0
turned on to bring in fresh
air. During this time, the
10.0
shelterists must breathe in a
sealed shelter atmosphere.
8.0
The safe duration time is
6.0
based on a 3% carbon
dioxide limit. The time it
4.0
takes for the shelter
atmosphere to reach this
2.0
limit is a function of the
number
of
shelterists,
0.0
1
2
3
4
5
6
7
8
9
10
degree of physical activity
NUMBER OF SHELTERIST S
of the shelterists, and the
volume of the shelter above
the floor. This duration is shown in the adjacent graph for adults performing mild work producing 0.67 ft3 of
carbon dioxide per hour.
HOURS TO REACH 3% CO2
ND6 SEALED SHELTER ATMOSPHERE
INTERNAL GENERATOR-OPTIONAL
The ND6 tornado shelter can be equipped with a 5.5 to a 20 KW LP generator with or without an EMP shielded
enclosure meeting MIL-288-125A. An underground 1000 gallon liquid propane tank and the 5.5 generator will
supply enough power for most conventional homes for up to 6 months. A battery bank and inverter package are
also available to extend the power supply.
STORAGE VOLUME
The ND6 with the optional bunk floor plan will allow for storage of approximately twenty 5 gallon buckets under
the bunks.
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
Patents Pending
ND6 STORM SHELTER
Copyright© 2013
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
As an underground storage pod, the ND6 can store 215 five gallon buckets or 1400 No. 10 cans plus
approximately 1000 pounds of ammunition and rifles. ``
SHIPPING AND INSTALLATION
U.S. and Canadians citizens have a legal right to install a shelter. Under the second amendment of the United
States Constitution, U.S. citizens are guaranteed the right to bear arms to provide protection in life threatening
situations. Tornadoes, hurricanes, fires and earthquakes fall under this amendment as life threatening forces. A
Storm Shelter falls under this classification as a defensive arm. Radius shelters do not have a foundation or
running water and therefore usually do not fall under the local building codes.
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
EXCAVATION
The customer hires a contractor to dig a hole with a bottom dimension of 14 feet wide x 14 feet long at a depth of
10 ft. A one to three-inch layer of pea stone is spread in the center of the floor of the hole. The top of the hole
should be larger to allow for sloped walls. The excavation usually requires approximately 2 hours. A 17,000
pound excavator or larger should be used to dig the hole and lift the ND6 off of the delivery truck and into the
hole. If the shelter is installed in a flood zone, the shelter should be installed so the hatch is one foot above the
100-year flood plain or 2 feet above storm tide surge. Berming can also be used if the shelter is installed in a
location which has ledge.
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
SHELTER INSTALLATION
The ND6 should be installed so the hatch is at least one foot above the 100 year flood plain or two feet above the
100 year storm surge. The ND6 can be installed in a back yard or under a garage concrete floor before the
footings are poured and installed at the proper height in relation to the concrete slab. Normally the shelter is
installed on the center line of each car bay in the garage or between the two bays so the hatch is positioned
between the two front tires of the car. This will work as long as the inside distance between the tires is greater
than 40 inches. When entering the shelter during Tornado use, the garage door should be opened at least 6 inches
to allow fresh air to enter the garage where both inlet and outlet exchange air.
SHELTER INSTALLATION (summary)
1. The excavator digs a hole that is 14 ft wide, 14 ft. long and 10 ft. deep.
2. 1-3 inches of pea stone or sand is place on the bottom center of the hole and leveled.
3. The excavator lifts the ND6 off of the truck and tracks it back to the excavated hole and lowers the
ND6 into the hole.
4. The shelter is leveled at the proper height at the bottom of the hole by shoveling pea stone under
the bottom of the shelter gravity flange.
5. The shelter is then backfilled with 10 yards of pea stone. If sand is used, it must be compacted
with a “Jumping Jack” or watered. After this stage, the surrounding soil can be used for backfill
and must be compacted evenly around the shelter.
6. When the backfilling reaches 12 inches below ground level, the thru-hull coupling can be used to
connect the shelter to outside power, telephone lines, antenna lines etc.
7. Backfilling continues to the original ground level. Backfilling usually requires approximately 4
hours.
WARRANTY
Radius Engineering Inc. Warranties that the fiberglass parts of the ND6 Tornado Shelter will not leak, corrode, or
structurally fail for the lifetime of the original owner for the original installation provided that 1) the shelter is not
exposed to excessive overpressure 2) The structural parts of the shelter are not modified 3) The shelter is
inspected, off-loaded, assembled, backfilled and installed in accordance with the company’s installation
instructions. 4) structures are not built on top of the shelter. The warranty does not apply to the parts and
equipment that Radius Engineering Inc. does not manufacture. These items are covered by the individual
manufacturers. Radius Engineering Inc. is continuously improving its product and therefore reserves the right to
change any specification without notice. Our liability under this warranty shall be limited to, at our option, repair
of the shelter, or delivery of a replacement shelter to the point of original delivery, or refund of the original
purchase price. We shall not be liable for any indirect or consequential damages, labor, or installation costs.
ND6 TECHNICAL DATA
Air blower life ............................................................ 40,000 hours
Air blower type ........................................................... 8-in dia. Reverse curve centrifugal 12-V, 5 watt
Air blower volume...................................................... 50 cfm @ 0.1 in S.P.
Air filter ...................................................................... none
Air manifold ............................................................... steel elliptical dome with baffle/drain
Armor level................................................................. none
Assembly time ............................................................ 0
Backfill material required ........................................... pea stone (10 yards)
Batteries ...................................................................... 1 - 100 amp hour AGM
Battery Charger .......................................................... solar panel/controller
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
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ND6 STORM SHELTER TWISTER RESISTER
Proven Reliability and Innovation
Capacity-adults ........................................................... 3 hurricane, 6-10 tornado
Bunks .......................................................................... optional
Connector port to other shelters ................................. optional 36 in diameter
Duration-blower + light 24hr/day – 6 adults .............. 2 days
Emergency escape ...................................................... 5,000 lb jack
Entry Type .................................................................. horizontal hatch alum or steel
Excavated hole size .................................................... 14 ft. x 14 ft. – 10 ft. deep
Floor material ............................................................. fiberglass
Floor space ................................................................. 52 ft2
Fuel Tank .................................................................... none
Hatch cover................................................................. 24 in x 24 in clear opening
Hatch Utility Opening ................................................ 36 x 46 inches
Hatch dome –angle of incidence ................................ 0 degrees
Hatch latching system................................................. 4-dog with interior handle and external key
Hatch pressure resistance ........................................... 5 psi neg, 6000 lb neg. 6,000 lb pos
Height Overall ............................................................ 10.5 ft.
Hull material ............................................................... structural vacuum infused fiberglass
Hydrostatic pressure (buoyancy) ................................ 24,461 lbs.
Hydrostatic counter pressure (earth gravity) .............. 30,970 lbs S.F. 1.2
Implosion type ............................................................ non-catastrophic
Installation time .......................................................... 1 day
Interior color ............................................................... white, flame of 25-50 Type II, ASTM E84
Lighting ...................................................................... 12 volt -LED 500 lumens
Lift connection ........................................................... Lifting ear on shelter
Max .wind ................................................................... 350 mph
Max. Headroom .......................................................... 8’ - 0”
Minimum headroom ................................................... 6’- 4”
Overall height ............................................................. 10.5 ft.
Overall diameter ......................................................... 98 inside diameter, 134 in outside diameter
Overpressure – allowable ........................................... 5 psi with no earth-arching effect
Pick Height On trailer................................................. 13.5 ft.
Power Source .............................................................. Solar Panel with controller
Pressure Rating ........................................................... Static earth @ 140lbs/ft2 + 5 psi ext press
Protection Factor Gamma ........................................... 0
Protection Factor Neutron .......................................... 0
Sealed shelter atmosphere- 6 adults ........................... 2 hour
Septic System ............................................................. chemical toilet
Shape .......................................................................... vertical tapered cylinder/elliptical dome
Shelter Rating- ............................................................ F5 GZ Tornado, hurricane, 8.5 R earthquake, and fire
Shipping weight .......................................................... 1,800 lbs.
Shipping width ........................................................... 11 ft.-3 in
Stairwell...................................................................... 68 degree 8 in. tread x 12 in rise
Storage volume-under floor ........................................ 0
Thru hull hookups....................................................... outside 110-volt, antenna cables, solar, etc. (2)
Volume-Total ............................................................. 392 ft3
Water table allowable height ...................................... full water table to ground surface
Water Tank ................................................................. none- customer to supply bottled water
Ki Canada Ltd.® 707 Alness st. Suite 206, Toronto, Canada M3J 2H8 416-661-1818
Patents Pending
ND6 STORM SHELTER
Copyright© 2013
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